Fuel-pump for internal-combustion engines.



B. KRA ER. FUEL PUMP FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED OCT. 30. I912.

Patented Oct. 26,1915.

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- InVenTor Bern/ward Kr Witnesses:-

BERNHARD KRAMER, F GHARLOTTENEURG, GENEANY, ASSIGNOR T0 GENERAL ELECTRIC CQMPANY, A GURPORATION OF NEW YORK.

FUEIi-PUMP FUR INTER-NAL-COMEUSTION ENGINES.

Specification of Letters Patent. I Patented (Will. 26, ll llfit Application filed October 30, 1912. Serial No. 728,665.

To all whom it may concern:

-Be 113 known that l, BERNHARD KRAMER,

a subject of. the Emperor of Germany, re?

siding at Charl0ttenburg, Germany, have invented certain new and useful Improvements in Fuel-Pumps for Internal-Combustion Engines, of which the 'following'is a specification.

The present invention relates to pumps for supplying fuel, such as crude oil, to in ternal combustion engines and in particular to that type wherein air in the combustion space is compressed to a temperature sufficiently high to ignite the injected -main shaft. The speed relation between power transmitting means.

plan view of a multi-cylinder pump; Fig. 2 i

is a section taken on line A-A of Fig. 1,

and Fig. 3 is a view in end elevation of an engine fitted with my fuel pump.

Referring to Fig. 3, 4 indicates a multicylinder internal combustion engine adapted to be operated with crude oil as the fuel.. 5 indicates the main shaft thereof, and 6 the pump shaft. This shaft may also be employed to actuate the cams for opening and closing the various fuel and other main valves. The shafts 5 and 6 are connected together by a chain 7 or other suitable As shown the shaft 6 revolves at half the speed of the these shafts will depend upon the type of engine, as is well understood; 8 indicates a pump casing which is provided with as many cylinders 9 as is desired. Tn each of these cylinders is a plunger 10 which is raised by the spring 11. For each cylinder there is a spring seated discharge valve 12 that controls the passage of fuel through the pipe 13 leading to an engine cylinder. Each cylinder is also provided with a suction valve 14 of the piston type, said valve shafts.

being provided with a plurality of axially extending grooves 15 through which the fuel passes from the supply chamber-.16 when the valve is open. The valve is opened by a spring l5 Working against'the cam. The several plungers'a're actuated by the shaft 6, said shaft being provided with as many cams 17 as there are plungers. Each cam as it revolves is arranged to depress its plunger against the action of the spring 11 and discharge fuel through the spring seated valve 12 or back into the chamber 16 depend-- ing upon the amount of opening of the suction valve 14 The shaft 6 is supported by suitable bearings 18 and on one end thereof is the gear 19 which meshes with asimilar gear carried by the shaft 20. The speed relation of the shafts G and 20 is 1 r to 1. Splined on the shaft 20 is a sleeve 21 which -is adapted to be moved longitudinally there on by the speed governor 22. Mounted on the sleeve are cams 23 which control the operation of the suction valves 14:. These cams vary uniformly in radiusfrom one end to the other in an axial direction so that as Y the sleeve 21 which. carries them is moved along the shaft, the relation of the cams to the suctionvalves and hence their effect thereon will be varied. From Fig. 2 it will be seen that the cams 17 and 23 occupy the same angular position with respect to the cams for actuating the right-hand pump and controlling its suction valve are displaced from those on the left hand side by 90 so that the right hand pump will deliver its charge of fuel before the left-hand one. This arangement is useful in multi-cylinder engines whose cylinders fire one after the other and where it is desired to supply fuel to each puli erizer as much in advance of the opening of its needlevalve as possible. It is to he noted that the suction valve cams 23 are'relatively wide at one end and taper to a point atthe other. The object From Fig. 1 it will be seen that the I of this arrangement is to permit of a variationin the period that the suction valve open or closed."

I The operation of my invention is as follows: Assuming that the engine has been properly started, the shaft 6 turns the cam 17 and whenthe latter engages the roller on the upper end of the plunger the shaft depresses it on the discharge stroke and subsequently the spring 11 raises the plunger to the position shown. While this action is taking place thecam 23 has been depressing the suction valve'l4 to a greater or less extent, and at some time in its stroke it closes and thereafter fuel flows through the discharge valve. With the parts in the position shown in Fig. 2 all of the fuel displaced by the plunger 10 wouldflow back to the chamber '16 because it could freely pass through, the grooves l5..in the suction valve. On. the

. cessible and it is an easy matter to take it down for the purpose of. inspection or re ge'ous fora multicylinder pump such as are pair. v r

The arrangement is particularly advantacommonly used for oil'engines because all of the plungers can be arranged in one row nd all of the suction valves in another row ith a means common thereto for actuating. In accordance with the provisions of the patent statutes, I have described the princi ple of operationof my invention together with the apparatus which I now consider to represent the best embodiment thereof; but

* I desire to have it understood'that the apparatus shown isonly illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In a pump, the combination of a cylinder, a plunger therefor, suction and discharge valves for the cylinder, a pair of-' shafts, gearing between the shafts, a cam on one shaft for actuating the plunger, a cam on the second shaft for controlling the suction, valve, said last named cam having an inclined face and being axially movable on the shaft to vary the periods of opening and closing of the suction valve, and a governor for moving such cam.

"2. In a pump, the combination of a cylinder, a plunger therefor, suction and discharge-valves for thecylinder, a pair of shafts, gearing between the shafts causing them to revolve at the same speed, a cam on one shaft for. actuating the plunger, a cam on, the second shaft for controlling the suction valve, said cams occupying the same angular, position on their IQSPBCfiXG shafts and said last named cam having an inclined face and being movable axially on the shaft, and a speed governor mounted on the shaft which carries the axially movable cam for moving it longitudinally thereon.

' 3. In a pump, the combination of a cylinder, a plunger therefor, suction and discharge valves for the cylinder, a shaft for actuating the plunger, a second shaft geared to the first, a cam carrying sleeve on the second shaft, and a governor driven by one of the shafts for moving the cam sleeve longitudinally to vary the action of the suction valve.

4. In a pump, the combination of cylinders arranged in a row in the same plane, plungers therefor, suction valves arranged in a second and parallel plane, parallel cam shafts, means on one of said shafts for actuating the plungers, a member movable axially of the other shaft, cams carried by said member for actuating the suction valves, the action of said cams on the suction valves being varied according to their axial position thereon, a governor for moving said member axially on its shaft, and means for operating the shafts.

In Witness whereof, I have hereunto set my hand.

BERNHARD KRAMER. Witnesses:

HERBERT SCHULTZE, Gnome MUNNUT. 

